JPS6172081A - Light curable filler for filling gap between both end parts of copperplate printing plate developed on rotary drum - Google Patents

Abstract

Photocurable filling compounds for closing the gaps which result between the end or edge regions of gravure printing plates when the latter are clamped on forme cylinders consist of a homogeneous, solvent-free, photopolymerizable mixture which is free-flowing at room temperature and contains from 10 to 90% by weight of one or more hydrophilic, polar, photopolymerizable, ethylenically unsaturated low molecular weight compounds, from 5 to 65% by weight of one or more polymeric binders which are resistant to toluene-containing, gasoline-containing, ketone-containing and/or ester-containing solvents and are compatible with the photopolymerizable low molecular weight compounds, from 0.01 to 10% by weight of one or more photoinitiators and from 0 to 70% by weight of further additives and/or assistants.

Description

Detailed Description of the Invention (Technical Field) The present invention particularly relates to the formation of a circular cross-section in an intaglio rotary printing press, which is based on the gap created between the ends of an intaglio printing plate stretched and mounted on an arcuate drum. This invention relates to a photocurable filling material for filling. The photocurable filler material is particularly suitable for filling the above-mentioned gaps when an intaglio printing plate with a layer of synthetic cat fat is mounted on a rotary drum.

(Prior art #f) In order to form an intaglio rotary printing plate consisting of a flexible support with good dimensional stability and a printing plate layer provided thereon, a suitable holding and spreading material is used. It is already known to magnetically or even mechanically mount an intaglio printing drum onto an intaglio printing drum. This allows a plurality of printing plates to be mounted sequentially and side by side on the circumferential surface of the drum. However, in order to mount the curved intaglio printing plate on the drum, a drum is provided with grooves running parallel or diagonally to the drum axis so as to separate one or both ends of the drum. This is particularly significant when using rotary intaglio printing.

In this case, the intaglio printing plate is simply manufactured by laminating a synthetic resin printing layer on a dimensionally stable support.

A narrow gap is provided between both ends of a single intaglio printing plate when it is spread out on a drum, and also between the side edges of each plate when multiple intaglio printing plates are arranged side by side. Alternatively, the printing plate surface is interrupted by slits. This gap must be filled with a suitable filling material in order to prevent the printing ink from penetrating into it and to ensure smooth operation of the doctor blade.

It is known to seal or fill such gaps with elastic backing materials or synthetic resin tapes, or with thermoplastic or thermoadhesive synthetic resins. For example, German Published Publication No. 2545618 describes a gap filling method when mounting an intaglio printing plate, in which the gap is filled with a two-component mixture that hardens in a short time by heating, especially a resin mixture of epoxide and polyester or acrylic. has been done. It has also been proposed to fill the gap between both ends of an intaglio printing plate spread on a drum with photocurable methacrylic resin or cyan acrylic resin, and then to cure this through polymerization initiated by ultraviolet irradiation. (See Deutscher, Drutska No. 41 (1975), pp. 17-22.

However, none of these gap-filling materials proposed so far have been fully satisfactory in actual use. The disadvantage is that the filler material is difficult to handle or does not have the necessary mechanical and chemical properties, such as resistance to printing ink solvents or resistance to doctor blade stress. In addition, the known filling materials tend to become brittle, causing cracks to form in the gaps in a short period of time, causing ink to penetrate there and causing printing problems, or the adhesive strength of the filling materials being insufficient, causing problems during printing. The filler material may peel off completely or partially. The thermosetting two-component mixture disclosed in DE 2545618 takes a long time to cure, or if an active two-component mixture is used to shorten this curing time, It has the disadvantage that its pot life, ie, pot life, is short and processing becomes insufficient. The use of photocurable methacrylic or cyan acrylic resins, as described in the above-mentioned reference, Deutscher and Drutschner, not only poses problems in handling, but the gaps filled with these resins are also problematic during the printing process. It has sufficient stability against stress. These known photocurable filling materials are extremely brittle and their adhesive strength is insufficient, especially when intaglio printing plates with synthetic resin printing layers are used. Despite much research and development, the problem of gap filling in intaglio printing plates spread on drums remains unsolved to the extent that suitable gap filling materials are much needed.

Therefore, the problem to be solved by the present invention is to fill gaps on the printing surface that occur when an intaglio printing plate is spread and mounted on a drum in an appropriate manner that can meet the demands that have been made at printing sites. The goal is to provide materials. Such filling materials are particularly easy to handle and process;
It exhibits good adhesion to the intaglio printing plate after gap filling, and the edges of the intaglio printing plate are thereby permanently and firmly interlocked, and the gap filling provided by the filler material is not as strong as toluene, which is commonly used in intaglio printing. Or be/zen-containing,
Furthermore, it must be resistant to printing ink solvents containing ketones or esters, have high mechanical strength, and have excellent resistance to doctor blade stress.

(Summary of the Invention) The above-mentioned technical problem is solved by at least one hydrophilic, polar, photopolymerizable, ethylenically unsaturated low molecular weight compound, and at least one hydrophilic, polar, photopolymerizable, ethylenically unsaturated low molecular weight compound which can coexist therewith and which is resistant to printing ink solvents. It also consists of one polymeric binder, at least one polymerization initiator, and optionally further additives and/or auxiliaries, and is fluid at room temperature and does not contain solvents.
It has been found that a filling material consisting of a photopolymerizable homogeneous mixture provides a solution.

Accordingly, the subject of the present invention is a photocurable filling material for filling the gaps that occur between the ends or edges of an intaglio printing plate when it is spread on a rotary drum, the material comprising: (a) at least one hydrophilic, polar, photopolymerizable, ethylenically unsaturated small molecules containing 10 to 90 weight % of the compound; (b) resistant to solvents containing toluene, benzene, ketones and/or esters; and the above composition (a
) that can coexist with the photopolymerizable low molecular weight compound of
(c) at least one photopolymerization initiator O1 to 10% by weight; (d) further other additives and/or auxiliaries O1 to 70% by weight; weight%
It is a filling material characterized in that it consists of a solvent-free, photopolymerizable, homogeneous mixture that is free-flowing at room temperature.However, the above weight percentages are based on the entire filling material mixture. It is something.

The filling material according to the invention for filling the gaps of a stretched intaglio printing plate is not only easy to handle and problem-free to use, but also the filling material can be irradiated with actinic radiation after filling the gaps. When hardened, it meets various conditions that have hitherto been practically required, particularly in terms of bonding strength and mechanical properties, such as hardness, flexibility, and abrasion resistance. Compared to conventional materials of this type, the result is a gap-filling material with a generally smooth, non-stick surface, improved durability and resistance, as well as improved printing resistance in the filled gap area. Four ink-receiving parts can be provided for this purpose, which is particularly useful in the case of rotary printing.

(Components of the Invention) Hydrophilic, polar, photopolymerizable monomers known per se are used as component (a) of the filling material according to the invention. In particular, photopolymerizable ethylene double bonds are conjugated or is preferably a moamer that can be activated into an OSN or S molecule by an adjacent group.The photopolymerizable ethylenically unsaturated low molecular weight compound used in the present invention may be monofunctional or polyfunctional. It may be functional.In other words, the number of photopolymerizable ethylene double bonds in the molecule may be one or two.
It may be more than one. It has been shown that when the filler material according to the invention contains a monofunctional heptadumer in large amounts or exclusively, it results in interstitial filling which is particularly durable and resistant. According to a particular embodiment of the invention, component (a) of the filling material according to the invention consists exclusively of monofunctional photopolymerizable monomers, or in combination with such monofunctional photopolymerizable monomers. It is composed of a mixture with small amounts of polyfunctional, especially difunctional, photopolymerizable monomers.

The hydrophilic, polar, photopolymerizable, ethylenically unsaturated low molecular weight compounds to be used as component (a) of the filling material according to the invention are N-vinyl compounds, α,β-olefinically unsaturated mono- or dicarboxylic acids. , and corresponding derivatives. N-vinyl monomers include, for example, N-vinyllactam, especially N-vinylpyrrolidone and N-vinylcaprolactam. Acrylic acid and methacrylic acid are particularly suitable as α,β-olefinically unsaturated carboxylic acids. Particularly preferred as photopolymerizable monomers are derivatives of α,β-olefinically unsaturated carboxylic acids, especially hydroxyalkyl(methane acrylates,
(derivatives of acrylic acid or methacrylic acid such as methacoacrylamide or (methaneacrylamide derivatives). Preferred examples of hydroxyalkyl (meth)acrylates include 2 to 20, especially 2 to 8 carbon atoms, for example 2
-Hydroxyethyl-(meth)acrylate 12-hydroxypropyl-(methane acrylate, 3-hydroxypropyl-(meth)acrylate, 1,4-butanediol-mono-(meth)acrylate, hexanediol-mono-(meth)acrylate acrylate, etc.Also polyalkylene glycol mono(methane acrylate, e.g.
Also suitable are lumono-(meth)acrylates.

Similarly used as a monomer in the present invention (as a methanacrylamide derivative, N-methylol-(
Mention may be made of methacoacrylamide and its diethers, such as the reaction product of 2 mol of N-methylol-(methanoacrylamide and 1 mol of ethylene glycol).

The selection of the hydrophilic, polar, photopolymerizable low molecular weight compound used as component (a) is particularly important in the selection of the polymeric binder used as component (b), which coexists with this photopolymerizable low molecular weight compound. This is done in accordance with the type f1■ and in accordance with the desired properties of the cured filling material. These hydrophilic, polar, photopolymerizable low molecular weight compounds can be used alone or in mixtures. It is possible to vary the mechanical properties of the cured filler material and thus also of the filling gap, for example by the type and amount of the 7-mers used or, if monomer mixtures are used, by the mixing ratio of these 7-mers. ,
and can be adjusted to the desired degree.

The filling material according to the invention is therefore generally 10 to 90% by weight, in particular 30 to 80% by weight, based on this total amount.
It can contain hydrophilic, polar, photopolymerizable low molecular weight compounds. The viscosity of the filling material is adjusted and changed by the amount of the photopolymerizable low molecular weight compound (a) used. When the amount of component (a) is very high, the filler materials are generally of low viscosity and high fluidity. Generally, it has a slightly high viscosity,
In addition, filler materials that still exhibit some fluidity at room temperature are preferred. This is because, on the one hand, the filling material must be uniformly distributed in the interstitial cavities, and on the other hand, no expensive guarantees are required for filling the interstitial cavities on the drum surface.

The filling material according to the invention further contains as component (b) at least one polymeric binder which can coexist with the photopolymerizable low molecular weight compound of component (&) above. The polymeric binders include toluene, benzene,
It is selected from those having resistance to printing ink solvents containing ketones and/or haesters. A highly suitable polymer binder for this is a styrene/maleic acid half ester copolymer. The copolymer contains comonomers of styrene and maleic acid half ester in a molar ratio of about 1:10. Other comonomer content proportions are also possible, as well as other comonomer contents, such as maleic anhydride and/or (
Polymerized meth)acrylates may also be used.

Styrene/maleic m-half ester copolymers are generally 15
It has a softening point of 0°C or higher, especially 180°C or higher,
The average molecular weight ranges from about 5,000 to 50,000.

Other polymeric binders suitable for the filling material according to the invention are linear polyamides, in particular for example French patent 15208
It is a linear soluble polyamide having repeating amide groups in the main chain of the molecule, which is known as a polymer binder for photopolymerizable recording materials, as described in US Pat. Particularly suitable polyamides are
Mixtures of one or more lactams, especially caprolactam, and at least one dicarboxylic acid/diamine salt, such as ε-caprolactam, 'hexamethylene diammonium dihydrate 4°4'-diaminodicyclohexylmethane /adipate salt can be produced by mixed condensation. The polyamides to be used according to the invention are from 20 to 80, in particular from 30 to 7
It has a value in the range of 0 (Fkencher's Twelrose Hemi 13.58 (1932)).

Particular preference is given to using polymer binders as component (b) which are soluble in the hydrophilic, polar, photopolymerizable, ethylenically unsaturated, low molecular weight compounds used as component (a). However, polymeric binders are also used that can coexist with the photopolymerizable low molecular weight compound of the composition (&), even though they can only be dispersed therein, resulting in a homogeneous flowable mixture. It is possible.

This polymeric binder in the filling material according to the invention (
The proportion of component (b)) is generally 5% based on the total amount of filling material.
% to 65% by weight, especially 10 to 50% by weight.

In addition to the photopolymerizable low molecular weight compound and the polymeric binder mentioned above, the filling material according to the invention contains as component (c) 1
0.01 to 5% by weight, especially 0.05 to 2% by weight of one or more types of photopolymerization initiators, based on the total amount of the filling material.
Contain in an amount of The polymerization initiators customary for photocurable materials and the compounds known per se can be used. In particular be/diynes and their derivatives, such as benzoin alkyl ethers, especially those having 1 to 8 carbon atoms in the alkyl group, such as benzoin monomethyl ether, benzoin isopropyl ether, α-hydroxymethylbenzoin and its alkyl ethers, e.g. α-Hydroxymethyl be/zoin methyl ether or α-methylbenzoin and its ethers, benzyl and its derivatives, especially benzyl monoketal, such as benzyl methyl ketal, benzyl methyl ethyl ketal or benzyl methyl benzyl ketal, as well as Acyl 7-year-old sphine compounds that can act as polymerization initiators, such as West German Publication Nos. 2830927, 2990994, 3020
No. 092, No. 3034697, No. 3114314 and 3
2,4.6-Dolimethylbenzoyldiphenylphosphinoxydolymethylbenzoylphenylphosphinic acid ethyl ester, 2,4.6-) IJ methylbenzoylbis-(〇-toluyl)- as described in No. 133419. Examples include phosphine oxide. Furthermore, α-hydroxyacetophenone, example sentence 4? 1-phenyl-2-hydroxy-2-methyl-1-propanone, 1-(p-isopropylphenyl)-2-hydroxy-2-methyl-1-propanone, 1-hydroxy-1
-benzoyl-cyclohexane, and other benzophenones, Michler's ketone, fluorenone, anthraquinone,
Examples of the photopolymerization initiator include xanthone, thioxa/ton, acridone, and derivatives thereof, which are known per se as photopolymerization initiators. The above-mentioned photopolymerization initiators can be contained in the filling material of the present invention singly or as a mixture. Also, known activators for these initiators may be added. Amine compounds are particularly advantageous as activators.

As additives and/or auxiliaries, they can be contained in an amount of O to 70% by weight, especially up to 50% by weight, based on the total amount of the filling material of the invention, but in particular polymerization inhibitors, stabilizers, antioxidants. agents, plasticizers, dyes, pigments and/or fillers. Examples of the polymerization inhibitor include hydroquinone, hydroquinone derivatives, N-nitrone amines such as 2+6-tert@-butyl-p-cresol, ditrophenol, N-nitrone diphenylamine, or N-nitron amines such as N-nitrone diphenylamine.
- Mention may be made of the salts of nitrosocyclohexylhydroxylamine, in particular the alkali salts and the aluminum salts.

The common use of fillers, such as glass powder, aluminum oxide, silicon dioxide, silica, alumina, silica, etc., is preferred not only because it evens out and reduces the shrinkage due to photocuring of the filler material according to the invention, but also because the filler It also has a positive effect on the surface properties of the interstitial spaces. Pigments and dyes can improve the appearance of the void filler and also facilitate the void filling operation. The addition of plasticizers also makes it possible to modify and adjust the viscosity and flow properties of the photocurable filling material according to the invention, and also influences important mechanical properties of the cured filling, such as resistance, elasticity, etc. . As a plasticizer,
Mention may be made of low molecular weight compounds, such as known heptatarate esters or hydroxyl group-containing compounds, such as glycerin, ethylene glycol, etc., which coexist with the above-mentioned components (&) and (b) of the filling material according to the invention. It is possible.

In a preferred embodiment of the filling material according to the invention, in addition to the polymerization initiator and optionally the additives and/or auxiliaries as mentioned above, styrene/maleic acid is used as the polymeric binder (component (b)). Half-ester copolymer and photopolymerizable ethylenically unsaturated low molecular weight compound (composition (a))
Examples include homogeneous photopolymerizable mixtures containing hydroxyalkyl acrylates and/or hydroxyalkyl acrylates in the abovementioned quantitative proportions for these components.

A styrene/maleic acid half ester copolymer is used as the polymeric binder and in particular mixtures of hydroxyalkyl acrylates and hydroxyalkyl methacrylates, such as 2-hydroxyethyl-acrylate and 2-hydroxyethyl-methacrylate, as components (&). This inventive filling material containing a mixture of lattice is particularly advantageous.

Other suitable examples which exhibit advantageous effects as fillers according to the invention include, in addition to a photoinitiator and optionally additives and/or auxiliaries such as those mentioned above, photopolymerization with soluble copolyamides as polymer binders. Examples of the ethylenically unsaturated low molecular weight compound include a homogeneous mixture containing (meth)acrylic acid and/or hydroxyalkyl (meth)acrylate. The above-mentioned copolyamide may be a mixed polyamide as described above, that is, one or more kinds of caprolactam and at least one kind of dicarboxylic acid.
/Diamine salt mixtures can be mentioned, and as the photopolymerizable low molecular weight compound, it is preferable to use a mixture of (meth)acrylic acid and/or hydroxylalkyl (methanoacrylate). In this case, the proportion of hydroxyalkyl (meth)acrylate in the monomer mixture is generally relatively high, for example preferably in the range from about 50 to 80% by weight, based on the monomer mixture.

When this filler material mixture contains the respective mixture components in the filler material, amounts above the ranges generally given for these components are preferred.

Generally, when extremely good adhesion of the cured filler material to the intaglio printing plate is desired, a photopolymerizable ethylenically unsaturated low molecular weight compound as component (a) or as component (b) is used. Particularly suitable are filler materials in which the polymer binder contains free carboxyl groups. In a suitable filler material mixture, the composition of free 000H groups (a) and/or
Alternatively, the amount in component (b) is the amount of component (a) +
(b) 0.5 to 10% based on the total amount. However, the free carboxyl group weight was set to 45.

The components of the filling material according to the invention, in particular the components (&)
and (1)) are mutually adjusted so that the resulting homogeneous mixture exhibits fluidity at room temperature. When using a polymeric binder that is solid at room temperature, the amount of photopolymerizable low molecular weight compound used will be correspondingly large enough to provide a fluid homogeneous solution or dispersion of the polymeric binder in the monomer. The filling materials according to the invention generally do not contain solvents. That is, it does not contain a non-polymerizable liquid compound that is easily volatile at room temperature. However, the inclusion of a small amount of such a non-polymerizable liquid compound that is easily volatile at room temperature in the filling material, for example, up to about 10% by weight based on the entire filling material, does not have a negative effect on gap filling. Also, after gap filling and curing, the filling material can be removed without damaging it. Therefore, in the present invention, a solvent-free filler material is essentially solvent-free and contains up to about 10% by weight, especially 2% by weight, of a non-polymerizable liquid compound that is easily volatile at room temperature. It should be understood to include filler materials containing less. However, filler materials that do not contain any solvent are preferred. Composition (
Solvent-free filler materials are highly preferred in which the photopolymerizable low molecular weight compound of a) forms a homogeneous solution of the polymeric binder of component (b).

The photocurable filler material according to the present invention can be applied to, for example, a metal intaglio printing plate having a conventional ballast skin.
Suitable for filling gaps in all intaglio printing plates having an arcuate or circular cross-section and to be spread on the drum of a rotary intaglio printing press. However, the filling material according to the invention is particularly suitable for gap filling in the case of intaglio printing plates with a resin printing layer, which are to be spread on a drum. In an intaglio printing plate having a synthetic resin printing layer, a resin layer is provided on a suitable printing layer support, and an intaglio plate for color printing is formed on this resin layer. This recess is formed on the resin printing layer by mechanical intaglio or laser intaglio (West German Publication No. 2752500).
or in the case of a photopolymerizable intaglio printing plate, it is formed by exposing a suitable photosensitive recording material in a resin printing layer to form an image and developing it (see West German Publication No. 3028098). No. 2061287, No. 3128949, or No. 3128951).

The photocurable filler material according to the invention is highly suitable for filling gaps such as those that are formed between the edges of a single intaglio printing curved plate when it is spread out on a drum. . This also applies when a plurality of intaglio printing plates are spread out one after another and/or laterally side by side on a drum, for example by means of hitherto customary saddle-like structures known per se. It is also suitable for filling gaps formed between ends and/or side edges. A particular advantage of the gap-filling material of the invention is that it eliminates the disadvantage of wide, deep gaps that form at the periphery of the individual plates arranged abutting each other when the intaglio printing plates are spread on a drum. It is also recognized that it can be filled permanently without any problems. Here, the term intaglio printing plate refers not only to a finished plate on which the four parts to be inked have already been formed, but also to an unfinished plate on which the four parts have not yet been formed. That is,
It is also possible to mount the finished printing plate on a drum and fill the gaps formed therein with a filler material according to the invention, or to mount the unfinished printing plate on a drum and then fill the gaps formed therein with the filler material according to the invention. It is also possible to fill with a filler material and then indent the printing layer of the plate. It is well known to spread intaglio printing plates onto drums, which are then mounted on the drum by permanent magnets or by mechanical means. Generally, a drum is used which has grooves for holding and stretching at least one end, preferably both ends, of the intaglio printing plate.

Any method for filling the gaps created when spreading an intaglio printing plate on a drum can be used with the filling material of the invention, as long as it fills the interstitial spaces uniformly and completely.

The filling material according to the invention can be injected into the interstitial space in a very simple manner, for example with a pipette, syringe or the like. Any excess filling material that may spill out can be simply and quickly wiped off the printing form. For the injection of such filling material into the interstitial space, it is also possible to use an injection device equipped with a suitable doctor blade. It is also possible to introduce the material of the invention into the interstitial spaces for gap filling, for example by methods such as those disclosed in DE 25 45 618 A1. According to this, the gap is covered with a rod-shaped body having a surface curvature that corresponds exactly to the curvature of the circumferential surface of the intaglio printing drum so as to be flush with the upper surface of the adjacent intaglio printing plate. A photocurable filling material is injected into the interstitial space created by the process.

can be easily carried out using the filling material of the present invention,
A particular advantage of this gap-filling method, which also provides a good surface finish without the need for post-treatment, is that the gaps formed between the edges or edges of the stretch-mounted intaglio printing plate are free from flakes or flexible By spreading something such as a plastic sheet over the gaps and over the surface of the printing plate, it can be coated so as to be flush with the surface of the adjacent printing plate. The photocurable filler material according to the invention is injected into the interstitial spaces thus created and then cured. Preferably, a transparent sheet is used to cover the interstices with this method, and the hardening of the filled filling material can be carried out with this sheet attached, and it is removed only after the filling material has hardened. Ru.

After the filler material of the invention is filled into the voids, it is subjected to actinic radiation for curing. Any light source capable of irradiating the filler material with radiation in the actinic wavelength range that is compatible with it can be used for this purpose. Especially about 250 to 450 n
m wavelength, such as carbon arc lamps, actinic or hyperactinic fluorescent tubes, low-, medium- and high-pressure mercury lamps (which may optionally be doped), xenon lamps or Something like σV laser is preferred.

This advantageous method of using the filler material according to the invention for gap filling will be explained in more detail with reference to the drawings.

In the accompanying drawings, a drum 1 of a rotary intaglio printing press with an arcuate or circular cross section has a rotating shaft, and as shown in FIG. 1, has a groove 2 formed from its surface toward the center. The edge 4 of the intaglio printing plate 3 spread on the drum 1 is (
In the illustrated embodiment, both ends are bent at an acute angle and hooked into the groove. To cover the gap 10,
A flexible sheet piece 6 extending to both end portions 5 is placed on the upper surface of the curved intaglio printing plate body 3. This flexible sheet piece 6
is preferably a transparent flexible synthetic citrus flake or an elastically bendable synthetic resin thin plate, which is particularly transparent to the curing actinic radiation and is easily peelable from the cured filler material. I prefer things. This flexible sheet piece 6 is composed of, for example, polyethylene terephthalate, polybutylene terephthalate, polyamide, polystyrene, polyethylene, polypropylene, polyvinyl chloride, in particular polyacrylate or polymethacrylate. This sea
The top piece 6 is supported by a movable pressing member 7. The pressing surface 8 of the pressing member 7 is curved in the same way as the upper surface of the end section 5 of the intaglio printing plate 3, but can also be deflected from this 6. It is also possible to provide only two pressure plates 15 arranged in parallel and movable up and down, arranged on both sides of the end of the intaglio printing plate and extending corresponding to the width of the drum. This pressing member 15
As shown in FIG. 4, the drum 1 may be configured such that, for example, a leg portion having a U-shaped cross section opens onto the drum 1. However, as can be seen in FIG. 3, it can be constructed in the form of separate plate-like elements, which are preferably mutually reinforced, with interstitial cavities formed by the coating between 0 and 10. 1 is provided through the wall surface 13 provided on the surface of the drum 1.
It is filled with the filling material of the invention, which is fed through the conduit or conduits 11. For this purpose, the interstitial space is sealed in its radial direction, ie relative to the center of the drum, in order to prevent the ingress of filler material into the pump, in particular the mounting device or the mounting element. Closure towards the center of the drum is effected and guaranteed by the purely structural features of the drum 1. However, this requires a backing 14 (FIG. 3) which extends over the entire length of the groove for closing the interstitial space 9. This can also be done by providing this backing member 1
4 may be a hollow body, but as shown in the figure, it may also be a hollow body such as a silicone rubber hose. In order to use a hollow body with a particularly circular cross-section as the backing element 14, it is conceivable that a further conduit (not shown) connected to a pressure source is provided to inflate said hollow body. This achieves a sufficiently reliable seal and also counteracts the shrinkage that may occur in the case of hardened filling materials, which does not occur, or in practice only rarely occurs, when using the filling materials according to the invention. It is staged. An inlet pipe and an outlet pipe are provided for the hollow body 14,
By switching the heating or cooling medium circuit under negative pressure, it is possible to adjust the flow behavior of the photocurable filling material when filling the interstitial space.

After filling the interstitial space, the pressing member 7 is withdrawn, and the covering sheet 6
is removed and the filler material present in the interstitial space is cured by actinic radiation. In this case, it is generally preferable to remove the covering sheet 6 after the filling material has hardened. In this case, a transparent sheet is used which allows the transmission of actinic radiation, and the interstitial space 9 filled with the filling material according to the invention is exposed to actinic radiation from the side of the pressing member in the lowered and pressing position via the sheet 6. I am forced to do it. For example, as shown in FIG. 4, a pressing member 7 having a U-shaped cross section is placed in an open state with respect to the drum 1, and the legs 15 are used to press the cover sheet 7 against the upper surface of the intaglio printing plate 3. Be pressed. An actinic radiation source 17 is installed in the space 16 within the lower end open pressing member. The space 16 is filled with a material transparent to actinic radiation, for example a suitable synthetic resin. This makes it possible to press the elastic flexible sheet 6 on the upper surface of the stretched intaglio printing plate 3 with the pressing member 7 during the working process, and thus to ensure that the gap space 9 is closed on the upper surface of the drum.
filling with a photocurable filler material according to the invention, and curing the filler material by actinic radiation while the pressing member 7 is still pressing the elastic flexible sheet 6 onto the top surface of the intaglio printing plate 3. becomes possible. Even when the pressing member 7 is substantially composed of only two pressing plates 15 as shown in FIG. 3, the same method as above can be applied by placing a radiation source between these plates and performing actinic irradiation. can be easily processed.

After the filling material hardens, the pressing member 7 is withdrawn and the sheet 6 is removed. If it is necessary to be able to easily remove the sheet 6 from the cured filler material, the surface of the sheet 6 can be treated with a release agent, for example siliconized.

The method described above ensures that the surfaces of both end portions of the intaglio printing plate 30 are closed, and that satisfactory gap filling can be achieved without requiring post-processing or causing failure during rotary printing. .

The present invention will be explained in more detail by the following examples.

Example ! Styrene/maleic acid half ester copolymer 21 ft, benzyl dimethyl ketal 0.7 ft).

It is dissolved in xyethyl acrylate 501. This solution, which is honey-like at room temperature, is spread on a drum and covered with polyester sheets at both ends of an intaglio printing plate having a synthetic resin printing layer. The gap-filling portion is irradiated with an ultraviolet fluorescent tube to cure, and the polyester sheet is then removed at ℃.

The thus treated drum was mounted on an Albertina intaglio printing machine and printed. No problems occurred in the gap filling portion during printing. Even after printing 5oooo copies, it was still in perfect condition.

Example 2 Copolymer 50 f and benzyl dimethyl ketal 4.51
and are dissolved in 100 P of acrylic acid. In this solution, 100r of hydroxyethyl acrylate, 1↑-
100g of siezil methacrylate and glycerin yloO
g and stir. As in Example 1, the gap between the ends of the intaglio printing plate carrying the synthetic resin printing layer stretched over the drum was filled with the filling material described above. The printing behavior of Toshino® treated in this manner was as described in Example 1.

[Brief explanation of the drawings] No. 11!1 is a recess l.1~' where the end of the intaglio printing plate is hooked together with a sheet piece covering the end and a suppressing member covered.
, FIG. 2 is a longitudinal sectional view of the printing cylinder similar to that in FIG. 1, and FIG. 3 is a printing cylinder similar to that shown in FIG. Figure 4 shows a version of the Schilling, in which the members generally consist of only two suppression members and in which a hollow member of round cross section is arranged in the interstitial space. 3 is a view of a plate cylinder similar to the figure; FIG. 2...concave groove, 6...sheet piece,
7.15... Suppressing member, 10... Gap special, n Applicant Pathfacti, / Gezershi, )・
Futo agent, patent attorney, 1st generation, black
Written amendment to administrative procedures (voluntary) November 27, 1985

Claims (9)

[Claims] (1) A photocurable filling material for filling the gap that occurs between the ends or edges of an intaglio printing plate when it is spread on a rotary drum, the material comprising: (a) at least one type of hydrophilic filling material; , 10 to 90% by weight of a polar photopolymerizable ethylenically unsaturated low molecular weight compound, and (b) exhibiting resistance to a solvent containing toluene, benzene, ketone and/or ester, and having the above composition (a)
at least one photopolymerizable low molecular weight compound that can coexist with the photopolymerizable low molecular weight compound of
(c) 0.01 to 10% by weight of at least one photopolymerization initiator;
and (d) further other additives and/or auxiliaries from 0 to 70% by weight.
A filling material characterized in that it consists of a solvent-free, photopolymerizable, homogeneous mixture which is fluid at room temperature and which is free-flowing at room temperature. (2) A filling material according to claim (1), which contains, as component (a), only a monofunctional monomer having only one photopolymerizable double bond or only this monomer. A filling material characterized in that it contains a mixture of functional monomers and small amounts of polyfunctional monomers. (3) The filling material according to claim (1) or (2), wherein the component (a) is N-vinyl monomer, (meth)acrylic acid, hydroxyalkyl (meth)acrylate, (meth)acrylamide and/or (
A filling material characterized by containing a meth)acrylamide derivative. (4) A filling material according to any one of claims (1) to (3), which comprises a styrene/maleic acid half ester copolymer as a polymer binder, that is, component (b). A filling material characterized by containing. (5) A filling material according to claim (4), comprising hydroxyacrylate and/or hydroxyalkyl methacrylate as the photopolymerizable low molecular weight compound and styrene/maleic acid half ester as the polymer binder. A filling material characterized by containing a copolymer. (6) A filling material according to any one of claims (1) to (3), which contains a linear, soluble copolymer as a polymer binder, that is, component (a). A filling material characterized by: (7) A filling material according to claim (6), wherein a mixture of (meth)acrylic acid and hydroxyalkyl (meth)acrylate is used as a photopolymerizable low molecular weight compound and a linear polymer binder is used as a polymer binder. , a filling material characterized in that it contains a soluble copolymer. (8) A filling material according to any one of claims (1) to (7), in which the component (a) and/or the component (b) contains a free carboxyl group. A filling material characterized by: (9) A filling material according to any one of claims (1) to (8), which contains a filler as component (d).